Ion CCC

Analogous to ion chromatography, CCC can separate both inorganic and organic ions according to their pKa of affinity to the ionic ligand dissolved in the stationary phase. One example is illustrated in Figure 8, which shows separation of rare earth elements by pH gradient elution of a hydrochloric acid mobile phase through a hexane stationary phase containing a ligand, di-(2-ethylhexyl)phosphoric acid. Figure 9 is another example showing the separation of catecholamine. The left chromatogram, obtained with a ligand-free solvent system, shows no sign of separation (Figure 9A). When a basic ligand, triethylamine, is added to the stationary phase, all components are resolved (Figure 9B).

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